containers: Install cockpit-dashboard in cockpit/ws container
containers: Install cockpit-dashboard in cockpit/ws container

On RHEL/Centos7, cockpit-dashboard ships cockpit-ssh, so the Centos
based container needs it.

Closes #9941

moraleslazaro/cockpit,deryni/cockpit,cockpituous/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,martinpitt/cockpit,garrett/cockpit,cockpituous/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,cockpituous/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,moraleslazaro/cockpit,deryni/cockpit,andreasn/cockpit,cockpit-project/cockpit,mvollmer/cockpit,cockpit-project/cockpit,andreasn/cockpit,moraleslazaro/cockpit,andreasn/cockpit,mvollmer/cockpit,cockpit-project/cockpit,deryni/cockpit,garrett/cockpit,cockpituous/cockpit,garrett/cockpit,martinpitt/cockpit,deryni/cockpit,moraleslazaro/cockpit,moraleslazaro/cockpit,andreasn/cockpit,cockpituous/cockpit,andreasn/cockpit,deryni/cockpit,garrett/cockpit,moraleslazaro/cockpit,cockpit-project/cockpit,martinpitt/cockpit,mvollmer/cockpit,deryni/cockpit,andreasn/cockpit,deryni/cockpit,andreasn/cockpit